Acpi Nsc6001 May 2026

Abstract The ACPI NSC6001 Hardware ID identifies the GPIO (General Purpose Input/Output) controller found on the AMD Geode LX series of system-on-chip (SoC) devices. While this hardware is largely obsolete, its implementation within the Linux kernel (specifically drivers/gpio/gpio-nsc768.c and the legacy nsc_gpio driver) provides a rich case study in the transition from legacy x86 embedded I/O to ACPI-enumerated device drivers. This paper dissects the hardware architecture, the Linux driver model complexities, and the specific role of ACPI in bridging a non-PnP legacy device into a modern OS framework. 1. Introduction The Advanced Configuration and Power Interface (ACPI) is the standard for device enumeration, power management, and configuration in x86-based systems. While modern systems are dominated by PCIe and ACPI-defined standard devices (e.g., PNP0C09 for EC), legacy embedded controllers often hide behind proprietary or semi-standard Hardware IDs (HIDs).

static void nsc_gpio_set(struct gpio_chip *chip, unsigned offset, int value) acpi nsc6001

Note: Documentation varies; the Linux nsc_gpio driver actually uses a simpler 2-register model: OUT and IN at offsets 0 and 1 (byte-wide). This discrepancy suggests two different revisions or the driver abstracts only a subset. Abstract The ACPI NSC6001 Hardware ID identifies the